One of the conversations I have had with data center friends is when will Facebook bring its Lulea data center online. The project was publicly announced in Oct 2011.

There was Swedish papers covering the commissioning process in May 2013.

Uhh, 18 months after project announce Servers are deployed. Building in Sweden was not as easy as it looks. Facebook has built 2 data centers in Prineville and Forest City.

Facebook posts on Lulea coming on line.

Luleå goes live

by Luleå Data Center (Notes) on Wednesday, June 12, 2013 at 6:14am

On the edge of the Arctic Circle, where the River Lule meets the Gulf of Bothnia, lies a very important building. Facebook's newest data center - in Luleå, Sweden - is now handling live traffic from around the world.

One of the speaking points is the green data center aspect.

As our systems come online for the first time, we are proud to say that this is likely to be one of the most efficient and sustainable data centers in the world. All the equipment inside is powered by locally generated hydro-electric energy. Not only is it 100% renewable, but the supply is also so reliable that we have been able to reduce the number of backup generators required at the site by more than 70 percent. In addition to harnessing the power of water, we are using the chilly Nordic air to cool the thousands of servers that store your photos, videos, comments, and Likes. Any excess heat that is produced is used to keep our office warm.